Duplex riveting machine



Dec. 31, 1940. L. A. WARD DUPLEX RIVETING MACHINE Filed April 2, 19158 2 Sheets-Sheet 1 throw Dec. 31, 1940.

L. A. WARD DUPLEX RIVETING MACHINE Filed April 2, 1958 2. Sheets-Sheet 2 IIIIIIIII L 75 gwve/wto b Lam 1:7 A. WARE Patented Dec. 31, 1940 UNITED STATES PATENT OFFICE DUPLEX RIVETING MACHINE poration of Michigan Application April 2, 1938, Serial No. 199,605

5 Claims.

This invention relates to riveting machines and is particularly adapted for use in riveting curved surfaces and for securing together thin bodies such as sheet metal sections which do not have sufficient inherent strength and support to prevent a rivet from tilting or cocking during the heading up operation.

An object of the invention is to provide a riveting machine arranged to clamp the rivet in the work prior to the heading up.

Another object of the invention is to employ the usual set of a riveting machine to clamp a rivet to the work prior to heading up and to provide a structure in combination therewith for heading up the rivet while it is so clamped.

A further object of the invention is to provide a machine for simultaneously heading up two rivets in work having a curved surface.

A further object of the invention is to provide a machine for simultaneously heading up a rivet in. a curved work surface while clamped in the Work.

A still further object of the invention is to provide a novel structure for coordinating the clamping and heading up of the rivet in the above described invention.

These and other objects will be apparent from the following specification when taken with the accompanying drawings, in which Fig. 1 is a partial section taken on the line I-I of Fig. 3,

Fig. 2 is a portion of Fig. 1 shown in. another position,

Fig. 3 is a section on the line TIL-III of Fig. 1,

Fig. 4 is a section on the line IVIV of Fig. 5, Figs. 3 and 4 together illustrating an irregular vertical section through the machine showing the relation between the parts thereof, and

Fig. 5 is a rear View of the portion of the machine illustrated in Fig. 4.

Referring to the drawings, the reference character l indicates a frame, to which is secured a table 2. The table 2 is curved and corresponds generally to the configuration of the work to be riveted. Disposed in the slideway 3 in the table 2 are plungers 4. Yieldably mounted in the plungers 4 are locating pins 5, which are yieldably urged upwardly by springs 6. The springs t are disposed in recesses in piston-like members i and plugs 3. The pins 5 are arranged to be received in the rivet holes in the work placed on the table 2 and are yieldably mounted to move back out of the way when a rivet is disposed in the rivet holes in the work. Downward movement of the pins 5 is limited by shoulders on the mal to the portion of the surface of the table 2 3 opposite which they are disposed.

Slidably mounted in the frame I is a pair of rams 9 having sets l0 adjustably mounted in the lower ends thereof. The sets Ill and the rams 9 radially extend in alignment with the plungers t, respectively. Associated with each set It] is a pair of rivet holding jaws 15 mounted from cantilever leaf springs IS. The jaws l5 are of the character disclosed in my copending application, Serial No. 101,210, filed September 17, 1936. Each pair of leaf springs IE is connected together and is connected to a member I], which is in turn connected to a ram 9 by a screw 18, as taught by the aforesaid application. As disclosed particularly in the aforesaid application, there is a resilient connection between the pairs of leaf springs 16 and the members [1, by means of which the rams 9 move the jaws l5 downwardly until they strike the work, but when they strike the work the set It] continues to move downwardly between the jaws l5.

Rivets are fed from hoppers I9 or in any other suitable manner to chutes 20. The chutes 20 communicate with selectors 2| of the character disclosed in the copending application of Ward et al., Serial No. 192,946, filed February 28, 1938. The selectors 2| function to let pass a single upsettable member from each chute 20 each cycle of operation. Upsettable members from the se-- lectors 21 pass down the chutes 22 by gravity onto seats 23 in the pairs of jaws IS.

The rams 9, and consequently the sets II], are actuated by cams 24 secured to shafts 25, as shown particularly in Fig. 1. The cams 24 act against follower rollers 26 on the outer end of each ram 9, the rams 9 being urged upwardly against the cams 24 by the springs 21. The function of the sets it is to dispose the rivets on the seats 23 into the rivet holes in the work disposed on the table 2 and aligned beneath the jaws 15 by the pins 5. The sets l0 then further function to clamp the rivets in the holes in the work prior to and during heading up. The heading up, or upsetting, of the rivets is accomplished by an eccentric 30, which comprises a roller bearing mounted on the eccentric portion 3! of a shaft 32, as shown particularly in Figs. 1 and 3. The lower ends of the plungers 4 ride on the surface of the eccentric 30, which may or may not rotate, but in actual practice creeps a little.

The operation of the machine from the position shown in Fig. 1 is as follows: Work is placed on the table 2, being located by the pins 5. As the cams 24 are rotated, the sets [0 are forced downwardly, forcing rivets from the seats 23 in the pairs of jaws I into the rivet holes in the work and clamping the rivets in the work. The axial adjustment of the sets In is such that when the high, or dwell, portions of the cams 24 are reached the rivets in the work are being clamped therein. As soon as the rivets are clamped in the work, the plungers 4 have moved upwardly under the action of the eccentric 30 to such a position that they upset or head up the rivets from the underside of the work, it being understood that when the pins 5 are moved downwardly against the action of the springs 6, their outer ends become portions of the active upsetting surfaces of the plungers 4 in the usual and known manner. Fig. 2 discloses the sets H] in clamping position with respect to the rivets in the work and the plungers 4 in full upper position, having just completed the upsetting, or heading up, of the rivets in the work. It will be understood that the sets ill, in addition to clamping the rivets in the work, also serve as anvils or backing members for the rivets during the heading up.

Referring particularly to Figs. 3 and 4, there is disclosed in effect an irregular vertical section through the machine showing the relation between the front portion, including the sets It? and plungers 4 and the rear portion, which includes principally the driving mechanism for the rams 9. Power is applied from some suitable source to the shaft 32, which, as hereinabove explained, drives the eccentric 30 through the eccentric portion 3!. The rear of the shaft 32 has secured thereto a cam 33. Slidably disposed directly above the cam 33 is a member 34 provided with racks 35 on each side thereof. The racks 35 engage with pinions 36 mounted on the shafts 25. The member 34 is provided adjacent the cam 33 with a follower roller 3'! so that as the shaft 32 rotates, the member 34, under the action of the cam 33, moves upwardly and is held upwardly when the high, or dwell, portion of the cam 33 comes opposite the follower roller 31. It will be understood that the-dwell portion of the cam 33 is active during substantially the same time as the dwell portions of the cams 24 are active. A spring 38 is provided to urge the member 34 toward the cam 33 to return the member 34 and the pinions 36, together with the shafts 25, to their initial positions when the high, or dwell, portion of the cam 33 becomes inactive and the low portion thereof becomes active.

The arrangement, as disclosed particularly in Figs. 3 and 4, is desirable because it not only provides a compact efiicient structure but also provides a positive coordination between the movement of the plungers 4 and the rams 9. It will be apparent from the foregoing specification that while I have disclosed two sets I0, it will be clear that I may use only one, or that I may use more than two. Furthermore, the principle of the invention may be applied to riveting machines having two or more sets which are arranged to work on fiat work and therefore need not be radially extending.

Having thus described my invention, what I desire to secure by Letters Patent and claim is:

1. A device of the character described for upsetting a rivet disposed in work having a curved surface, comprising a pair of radially extending sets, a table for supporting the work, said table having a curvature corresponding substantially to the work, means for simultaneously actuating said sets to clamp rivets in the work, said means comprising a pair of racks movable together and pinions associated with said sets cooperating with said racks, radial anvils in alignment with said sets, and means to move said anvils to upset the rivets.

2. A device of the character described for upsetting rivets disposed in work having a curved surface, comprising a pair of radially extending sets, a table for supporting work, said table having a curved surface corresponding substantially to the curvature of the work, means to actuate said sets to clamp rivets in the work, said means comprising a pair of racks movable together and pinions associated with said sets cooperating with said racks, and means to upset the rivets, said means comprising slidable radially extending plungers disposed in said table and in alignment with said sets, respectively, and an eccentric to actuate said plungers.

3. A device of the character described for upsetting a rivet disposed in work, comprising a set, means to move said set to clamp the rivet in the work, means to upset the rivet, a shaft for actuating said upsetting means, a second shaft for actuating said set moving means, a cam on said first shaft, a rack actuated axially by said cam, and a pinion on said second shaft actuated by said rack, whereby said second shaft is actuated from said first shaft.

4. A device of the character described for riveting work having a curved surface, comprising a pair of radially extending sets, a pair of radial anvils in alignment, respectively, with said sets, a pair of cams cooperating with said sets respectively, to move the same to clamp rivets in the Work, an eccentric to move said anvils to upset the rivets, a shaft for driving said eccentric, a cam on said shaft, a pair of racks movable together driven by said cam, a shaft for each of said first named cams actuating said sets, and pinions on each of said last named shafts, said pinions engaging with said racks, respectively, whereby said sets are actuated by said shafts which drive said eccentric.

5. A device of the character described for upsetting a rivet disposed in work having a curved surface, comprising a pair of radially extending sets, means for supporting the work, means for simultaneously actuating said sets to clamp rivets in the work, said means comprising a pair of racks movable together and pinions having operatively connected thereto means to move said sets, radial anvils in alignment with said sets, and means to move said anvils to upset the rivets.

LOYD A. WARD. 

